How do you beat the boss in 2-1 in Resident Evil 5

Shoot the chainsaw majini in the head or shoot the fire barrels when he is close and then run up to him and hit him. Remember to keep shooting him in the head instead of the body because he loses more health if shot in the head. Try to avoid being close to him as much as possible because one hit from him and you're dead. Also, make sure your partner doesn't get close either.